TITLE: GCN CIRCULAR NUMBER: 16738 SUBJECT: GRB 140824A: OSN optical limit DATE: 14/08/24 22:08:45 GMT FROM: Javier Gorosabel at IAA-CSIC F. Espartero (IAA-CSIC), F.J. Aceituno (OSN/IAA-CSIC), J. Gorosabel (IAA-CSIC/UPV-EHU) and A.J. Castro-Tirado (IAA-CSIC/UMA), report on behalf of a larger collaboration: We observed the field of GRB140824A (Beardmore et al. 16732) with the 1.5m OSN telescope at Observatorio de Sierra Nevada (Spain). The observations were carried out in the Clear band on Aug 24.84965-24.88029 (11.72-12.45 hours post bust). We do not detect any optical source brighter than R~21 consistent with the XRT position (Evans et al. 16735).